A double wall structure (22) for a combustor (15) of a gas turbine engine (10) comprising an inner wall (28) and an outer wall (27), the inner wall (28) comprising a plurality of main tiles (50), the main tiles (50) are secured to the outer wall (27) by a securing means (35), wherein the inner wall (28) further comprises a plurality of edge tiles (52) which are secured to the outer wall (27) by securing means (35), each edge tile (52) overlapping at least one edge (30, 31, 54, 61) of a main tile (50) thereby further securing the main tiles (50) to the outer wall (27).
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